Ukrainian boxing icons Vitali and Wladimir Klitschko hope Oleksandr Usyk can deliver 'special messages' with the world watching when he defends his heavyweight titles against Anthony Joshua in 2022.
Usyk was granted permission to leave Ukraine to begin preparations for his bout with Joshua.
The Ukrainian returned to his homeland last month to defend his beloved country from the Russian invasion.
However, the 35-year-old announced last week that he will battle it out with Joshua once again after comfortably defeating the Brit on points at the Tottenham Hotspur Stadium in north London.
It means Usyk now holds the WBA (Super), IBF, WBO and IBO titles.
Vitali Klitschko, the Mayor of Kyiv and former world heavyweight champion along with brother Wladimir, revealed he had discussed Usyk's return to sporting action.
The Klitschko brothers came to the decision to allow Usyk to fight Joshua - as it could have benefits for the Ukrainian defence.
"A very important message could be carried through an event like this," Vitali - who retired after retaining his WBC title over Manuel Charr in Moscow in 2012.
"We do not know if, in three months, we will exist.
"I actually have plans to speak to Oleksandr Usyk to give him advice if he decides to make the fight, to have some special messages that he can put out there."
Oleksandr Usyk outclassed Anthony Joshua during their clash last September.
Vitali, who assumed his position in office back in 2014, has vehemently condemned the Russian invasion since it began on February 24.
Wladimir, who was knocked out by Joshua at Wembley Stadium in 2017, admitted there were 'pros and cons' behind Usyk’s decision to leave Ukraine.
The 46-year-old added: "But to have the Ukrainian flag raised and our anthem played and one of our ambassadors of our country out there in the world, with the right mindset, could be more positive than negative."
Ukraine have implemented martial law since the conflict began, which bans men aged between 18 and 60 from leaving the country.
However, elite athletes have been awarded exemptions to compete on the world’s stage, although many of the nation’s athletes have joined the military.